DM-36873: Pythonify cell_coadds package

[arunkannawadi]

This is the main PR that effects most of the changes, while keeping the more distracting and more trivial changes in #13 .

[codecov-commenter]

Codecov Report

Merging #11 (af57d7e) into main (71c8664) will decrease coverage by 42.09%. The diff coverage is 42.60%.

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@@             Coverage Diff             @@
##             main      #11       +/-   ##
===========================================
- Coverage   85.98%   43.90%   -42.09%     
===========================================
  Files          19       21        +2     
  Lines        1042     1123       +81     
  Branches      109      107        -2     
===========================================
- Hits          896      493      -403     
- Misses        123      622      +499     
+ Partials       23        8       -15     

Impacted Files	Coverage Δ
tests/test_GridContainer.py	6.59% <0.00%> (-91.82%)	:arrow_down:
tests/test_UniformGrid.py	27.41% <0.00%> (-69.64%)	:arrow_down:
tests/test_coadds.py	32.00% <0.00%> (-66.00%)	:arrow_down:
python/lsst/cell_coadds/_stitched_image_planes.py	47.61% <37.50%> (-25.40%)	:arrow_down:
python/lsst/cell_coadds/_grid_container.py	40.29% <40.29%> (ø)
python/lsst/cell_coadds/_UniformGrid.py	48.48% <48.48%> (ø)
python/lsst/cell_coadds/_stitchedPsf.py	51.35% <51.35%> (ø)
python/lsst/cell_coadds/_stitched_coadd.py	46.42% <57.14%> (-36.60%)	:arrow_down:
python/lsst/cell_coadds/_exploded_coadd.py	40.00% <75.00%> (-33.34%)	:arrow_down:
python/lsst/cell_coadds/__init__.py	100.00% <100.00%> (ø)
... and 18 more

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[arunkannawadi]

I'm going to fix mypy errors after #13 is merged.

[arunkannawadi]

@TallJimbo Since you last reviewed, I've made some trivial changes mostly to please mypy and fix some failing tests (due to change in the iterator). I'm also relying solely on the mypy reusable workflow and removing mypy check from tests.yaml, because they seem to have become incompatible with each other (likely due to different set of packages installed, I think). Let me know if you'd like to review the changes again. If not, I'll fixup the new commits and merge it early next week.

[TallJimbo]

Doesn't sound like I need to take another look.

[arunkannawadi]

Fair enough. I've fixed up the commits and everything is green. I'll merge this tomorrow FWIW.